import time
scale = 10
print("-----执行开始-----")
for i in range(scale+1):
    a='*'* i
    b='.'*(scale - i)
    c=(i/scale)*100
    print("{:^3.0f}%[{}->{}]".format(c,a,b))
    time.sleep(0.1)
print("----执行结束---")
